如何制作弹跳球？

Question

我想创建一些球，当它碰到边缘时，它会返回，而当它们彼此碰到时，它们会返回！我能够创建第一个！但我认为由于循环，大量创建球会消耗大量内存！谁能向我介绍一些更好的实施方法？

public class BouncingBall extends View{
private int xMin = 0;
private int xMax;
private int yMin = 0;
private int yMax;
private float ballRadius = 50;
private float ballX = ballRadius + 200;
private float ballY = ballRadius + 400;
private float ballSpeedX ;
private float ballSpeedY ;
private RectF ballBounds ;
private Paint paint;
private Random rand ;


public BouncingBall(Context context,float ballSpeedX, float ballSpeedY,float ballRadius,float ballX,float ballY){
    super(context);
    ballBounds = new RectF();
    paint = new Paint();
    this.ballSpeedY = ballSpeedY;
    this.ballSpeedX = ballSpeedX;
    this.ballRadius = ballRadius;
    this.ballX = ballX;
    this.ballY = ballY;
    rand = new Random();
    int pickColor = rand.nextInt(3);
    switch (pickColor){
        case 0 :
            paint.setColor(Color.parseColor("#6575ec"));
            break;
        case 1 :
            paint.setColor(Color.parseColor("#f7c644"));
            break;
        case 2:
            paint.setColor(Color.parseColor("#f54458"));
            break;
        default:
            paint.setColor(Color.parseColor("#6575ec"));

    }

}


@Override
protected void onDraw(Canvas canvas) {
    ballBounds.set(ballX-ballRadius, ballY-ballRadius,ballX+ballRadius,ballY+ballRadius);

    canvas.drawOval(ballBounds,paint);
    update();


    try {
        Thread.sleep(10);
    }catch (InterruptedException e){

    }
    invalidate();
}
private void update(){
    ballX += ballSpeedX;
    ballY += ballSpeedY;
    if (ballX + ballRadius > xMax){
        ballSpeedX = -ballSpeedX;
        ballX = xMax-ballRadius;
    }else if (ballX - ballRadius < xMin){
        ballSpeedX = -ballSpeedX;
        ballX = xMin+ballRadius;
    }
    if (ballY + ballRadius > yMax){
        ballSpeedY = -ballSpeedY;
        ballY = yMax-ballRadius;
    }else if (ballY - ballRadius < yMin){
        ballSpeedY = -ballSpeedY;
        ballY = yMin+ballRadius;
    }
}

@Override
protected void onSizeChanged(int w, int h, int oldw, int oldh) {
    xMax = w-1;
    yMax = h-1;
}
}